<template>
  <div class="spec-preview">
    <img ref="img1" :src="skuInfo.skuDefaultImg" />
    <div class="event" @mousemove="move"></div>
    <div class="big">
      <img
        ref="img2"
        :src="skuInfo.skuDefaultImg"
        :style="{ left: -2 * left + 'px', top: -2 * top + 'px' }"
      />
    </div>
    <div class="mask" :style="{ left: left + 'px', top: top + 'px' }"></div>
  </div>
</template>

<script>
import _ from 'lodash'
import { mapGetters } from "vuex";
export default {
  data() {
    return {
      left: 0,
      top: 0,
    };
  },
  methods: {
    move:_.throttle(function(e){
      let x = e.offsetX - 100;
      x = x < 0 ? 0 : x;
      x = x > 200 ? 200 : x;
      let y = e.offsetY - 100;
      y = y < 0 ? 0 : y;
      y = y > 200 ? 200:y
      this.left = x
      this.top = y;
    },1000/60) 
  },
  name: "Zoom",
  computed: {
    ...mapGetters("detail", ["skuInfo"]),
  },
  mounted(){
    this.$EventBus.$on('get-image',imgUrl=>{
      this.skuInfo.skuDefaultImg=imgUrl
    })
  }
};
</script>

<style lang="less">
.spec-preview {
  position: relative;
  width: 400px;
  height: 400px;
  border: 1px solid #ccc;

  img {
    width: 100%;
    height: 100%;
  }

  .event {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 998;
  }

  .mask {
    width: 50%;
    height: 50%;
    background-color: rgba(0, 255, 0, 0.3);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
  }

  .big {
    width: 100%;
    height: 100%;
    position: absolute;
    top: -1px;
    left: 100%;
    border: 1px solid #aaa;
    overflow: hidden;
    z-index: 998;
    display: none;
    background: white;

    img {
      width: 200%;
      max-width: 200%;
      height: 200%;
      position: absolute;
      left: 0;
      top: 0;
    }
  }

  .event:hover ~ .mask,
  .event:hover ~ .big {
    display: block;
  }
}
</style>
